> Argument is the externalities of carbon emissions have (negative) value, so a tax would bring those two things in line and encourage that only people who really need to fly do so.

If we charged $100-200 per ton of CO2, which is supposedly more than recapture would cost, that would only be about $1-2 per 50 miles. From the numbers being quoted here, it sounds like that would do very little to bring prices in line.